Download Pennsylvania Immediate Letter Of Resignation template, modify and send for signing using BoloForms Signature. In general, a resignation letter is fairly brief.The formatting of a professional resignation letter should be brief and to the point. Make sure to follow proper business letter format in your letter. State your intention to resign: Clearly state in the opening paragraph that you are resigning from your position. Be direct and to the point. A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude. But how do you transition from a fulltime job to a PRN job? Most importantly, what should be included in the resignation letter to an employer? I hope a two-week notice is sufficient for you to find a replacement for me.